LT1389BCS8-1.25#TRPBF

Voltage Reference Overview

The LT1389BCS8-1.25#TRPBF is a nanopower precision shunt voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 1.25V with an initial accuracy of ±0.05% and a maximum temperature coefficient of 20ppm/°C over the 0°C to 70°C operating range. The device operates with a minimum current of 0.6mA and features low dynamic impedance below 1.5Ω. It is housed in an 8-lead plastic SO package.

Voltage Reference Feature Summary

• Utilizes trimmed precision thin-film resistors and curvature correction for high stability
• Maintains regulation at ultralow operating currents down to 800nA
• Stable with capacitive loads without requiring external compensation capacitors
• Features low temperature cycling hysteresis due to advanced packaging

Voltage Reference Applications

• Portable meters
• Precision regulators
• A/D and D/A converters
• Calibrators

Voltage Reference Procurement Notes

Verify the specific B-grade suffix indicates a 20ppm/°C temperature coefficient rather than the A-grade 10ppm/°C specification. Confirm the TRPBF suffix denotes tape and reel packaging versus tube variants. Ensure the component matches the 8-lead SOIC footprint dimensions provided in the datasheet before integration.

Voltage Reference Selection Notes

Select this component when lowest power consumption and guaranteed temperature drift are critical requirements. It serves as a high-performance upgrade replacing older references like the LM185 or LT1004. Consider board leakage mitigation techniques, such as guard rings, to maximize performance given the nanopower operating characteristics.

Voltage Reference Part Context

This part belongs to the LT1389 family of nanopower precision shunt voltage references. The family includes versions with 1.25V, 2.5V, 4.096V, and 5V outputs. The LT1389 series is designed to replace standard zener references where superior accuracy and lower power consumption are necessary.

Voltage Reference Replacement Considerations

LT1389ACS8-1.25#TRPBF

Voltage Reference FAQ

Does the LT1389 require an output compensation capacitor?

No, the LT1389 does not require an output compensation capacitor but remains stable with capacitive loads.

What is the difference between the A and B grades of the LT1389?

The LT1389A grade guarantees a maximum temperature coefficient of 10ppm/°C, while the LT1389B grade guarantees a maximum temperature coefficient of 20ppm/°C.